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Finding the Fourth Proportional to 86,368.61, 129,260.31 and 53,109.74

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Solution

The fourth proportional to 86,368.61, 129,260.31 and 53,109.74 is: 79,484.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,368.61 : 129,260.31 = 53,109.74 : x
  2. Step 2: Convert to fraction form
    86,368.61/129,260.31 = 53,109.74/x
  3. Step 3: Cross multiply
    86,368.61x = 129,260.31 × 53,109.74
  4. Step 4: Simplify right side
    86,368.61x = 6,864,981,580.41
  5. Step 5: Solve for x
    x = 6,864,981,580.41/86,368.61
  6. Step 6: Final answer
    x = 79,484.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.